Final answer:
A hand sink must have clean running water, soap, and a method for drying hands. Thorough rinsing and drying are essential, and using a towel to turn off faucets and open doors maintains cleanliness.
Step-by-step explanation:
Every hand sink in a restroom environment, particularly in a public or commercial setting, should be equipped with properly functioning plumbing to provide clean running water for hand washing. Additionally, it's necessary to have soap available for effective cleaning and a method for drying hands, such as clean towels or a hot air blower.
It's important to rinse thoroughly, ensuring water flows from the wrist to fingertips, and to dry hands with a clean towel, utilizing the towel further to turn off faucets and open doors to maintain cleanliness. Notably, some restrooms, like the example from South Africa, provide additional amenities such as a free condom dispenser next to the hand-drying apparatus, although this is not a standard requirement for hand sinks.